<template>
    <div>
        <!-- 顶部滑动条区域 -->
        <div id="slider" class="mui-slider">
            <div id="sliderSegmentedControl"
                class="mui-scroll-wrapper mui-slider-indicator mui-segmented-control mui-segmented-control-inverted">
                <div class="mui-scroll">
                    <a :class="['mui-control-item',item.id==0?'mui-active':'']" v-for="item in cates" :key="item.id"
                        @click="getPhotoListByMenuId(item.menuId)">
                        {{ item.menuTitle }}
                    </a>
                </div>
            </div>
        </div>

        <!-- 图片列表区域 -->
        <ul class="photo-list">
            <router-link v-for="item in list" :key="item.id" :to="'/home/photoinfo/'+item.pnId" tag="li">
                <img v-lazy="'http://'+item.thumbList[0]">
                <div class="info">
                    <h1 class="info-title">{{ item.pnTitle }}</h1>
                    <div class="info-body">{{ item.pnNews }}</div>
                </div>
            </router-link>
        </ul>
    </div>
</template>

<script>
    // 1.导入mui的js组件
    import mui from '../../lib/mui/js/mui.min.js';

    export default {
        data() {
            return {
                cates: [], //所有分类列表数组
                list: [], //图片资讯列表数据
                picList: [] //单个资讯的列表数据
            };
        },
        created() {
            this.getAllCategories();
            this.getPhotoList();
        },
        mounted() { // 当组件中的dom结构被渲染好，并放到页面中的时候，会执行这个钩子函数
            // 如果要操作元素了，最好在mounted里面，因为这时的元素是最新的
            // 2. 初始化滑动条
            mui('.mui-scroll-wrapper').scroll({
                deceleration: 0.0005 //flick 减速系数，系数越大，滚动速度越慢，滚动距离越小，默认值0.0006
            });
        },
        methods: {
            getAllCategories() { // 获取所有图片
                this.$http.get("front/photos/menu").then(result => {
                    if (result.body.code === 1) {
                        result.body.data.unshift({
                            menuTitle: "全部",
                            menuId: "all",
                            id: 0
                        });
                        this.cates = result.body.data;
                    }
                })
            },
            getPhotoListByMenuId(menuId) {
                // 根据分类id获取图片列表
                this.$http.get('front/photos/news/menu/' + menuId).then(result => {
                    if (result.body.code === 1) {
                        this.list = result.body.data;

                    }
                })
            },
            getPhotoList() {
                // 获取图片列表
                this.$http.get('front/photos/news').then(result => {
                    if (result.body.code === 1) {
                        this.list = result.body.data;

                    }
                })
            }

        }
    }
</script>

<style lang="scss" scoped>
    * {
        touch-action: pan-y;
    }

    

    

    .photo-list{
        list-style: none;
        margin: 0;
        padding: 10px;
        padding-bottom: 0;
        li{
            background-color: #ccc;
            text-align: center;
            margin-bottom: 10px;
            box-shadow: 0 0 9px #999;
            position: relative;
            img{
                width: 100%;
                vertical-align: middle;
            }
            img[lazy=loading] {
                width: 40px;
                height: 300px;
                margin: auto;
            } 

            .info{
                color: white;
                text-align: left;
                position: absolute;
                bottom: 0;
                background-color: rgba(0,0,0,0.4);
                max-height: 84px;
                .info-title{
                    font-size: 14px;
                }
                .infro-body{
                    font-size: 13px;
                }
            }
        }
    }
</style>